diff --git a/test-requirements.txt b/test-requirements.txt
index b7bb0e9ff..34d84684b 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -13,7 +13,7 @@ python-cinderclient!=1.7.0,!=1.7.1,>=1.6.0 # Apache-2.0
 python-glanceclient!=2.4.0,>=2.3.0 # Apache-2.0
 requests-mock>=1.0 # Apache-2.0
 sphinx!=1.3b1,<1.3,>=1.2.1 # BSD
-os-client-config!=1.19.0,!=1.19.1,!=1.20.0,!=1.20.1,>=1.13.1 # Apache-2.0
+os-client-config!=1.19.0,!=1.19.1,!=1.20.0,!=1.20.1,!=1.21.0,>=1.13.1 # Apache-2.0
 oslosphinx!=3.4.0,>=2.5.0 # Apache-2.0
 testrepository>=0.0.18 # Apache-2.0/BSD
 testscenarios>=0.4 # Apache-2.0/BSD